We're going turn to the health scare in the air. When a passenger from austin to phoenix was found to have a health condition after the plane took off. Jood morning, jim. Reporter: Good morning, jorng. You can hadd this to the list of things you don't want to hear on your next flight. Passengers, upon deplaning, get a tuberculosis test. Once in the air, a frightening development. The tsa notifying the airline that a passenger on board had been put on the no-fly list because of a medical condition. The rest of the passengers and crew members potentially at risk. We spoke to one of them overnight. As we were taxiing, a stewardess came down the aisle. She had a mask. She instructed this gentleman to put the mask on. Reporter: This morning, it's believed that the condition was tuberculosis. Though u.S. Airways would not confirm. The warning that came from the kdc did not occur until after the flight departed. The passenger didn't have a red flag in their warning system. Reporter: Passengers were told to get a tb test and follow up with the cdc. The fireman said he has tuberculosis, he's contagious, you must see physicians immediately and be tested in three months time. Reporter: It's a bacterial infection of the lungs. Exposure to other passengers would be unlikely, says the cdc. Why didn't the cdc warn the tsa before the passenger got on the plane? We hope to find out more about that today. George? Thank you, jim. Many are wondering about

This transcript has been automatically generated and may not be 100% accurate.

Now Playing: Winter storm warnings issued from the Rockies to the Northeast

Now Playing: FBI admits it dropped the ball after being warned about school shooting suspect

Now Playing: {{itm.title}}

{"id":21066931,"title":"Passengers Warned of Possible TB Exposure on Landing","duration":"3:00","description":"TSA notified flight that a passenger was put on the no-fly list because of a medical condition.","url":"/GMA/video/us-airways-flight-tuberculosis-scare-passengers-warned-tb-exposure-landing-21066931","section":"GMA","mediaType":"default"}